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Simplify mantissa handling

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This commit is contained in:
Julius de Bruijn 2020-07-09 11:21:13 +02:00 committed by Austin Bonander
parent 47de479454
commit 08f55bfc28
1 changed files with 4 additions and 14 deletions
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18
sqlx-core/src/postgres/types/decimal.rs
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@ -1,8 +1,7 @@
use std::convert::{TryFrom, TryInto};
use num_bigint::{BigInt, Sign};
use num_traits::ToPrimitive;
use rust_decimal::{prelude::Zero, Decimal};
use std::convert::{TryFrom, TryInto};
use crate::decode::Decode;
use crate::encode::{Encode, IsNull};
@ -105,19 +104,10 @@ impl TryFrom<&'_ Decimal> for PgNumeric {
// Bytes 5-8: lo portion of m
// Bytes 9-12: mid portion of m
// Bytes 13-16: high portion of m
let s = decimal.serialize();
let mut mantissa = u128::from_le_bytes(decimal.serialize());
// Moving the flags from the beginning of the array to the end, giving
// us a representation of u96 we can convert to u128.
//
// We also just set the flags as zero, so we don't need to chop them off
// from the resulting integer.
let mut mantissa = u128::from_le_bytes([
s[4], s[5], s[6], s[7], // lo portion
s[8], s[9], s[10], s[11], // mid portion
s[12], s[13], s[14], s[15], // hi portion
0, 0, 0, 0, // flags (cleared)
]);
// chop off the flags
mantissa >>= 32;
// If our scale is not a multiple of 4, we need to go to the next
// multiple.